<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		
		<script type="text/javascript">
			var sum = 1;
			for (var i = 1; i <= 13; i++) {
					sum*=i;
			}
			
			
			alert("13的乘介结果:"+sum);
			console.log(sum);
		</script>
	</body>
</html>
